So you're saying you do _not_ want them to leave the women and children behind somewhere?It may not be a violation of the text, but it is a reduction of risk, something this plotline in this episode can ill afford.
Either way would work IMO.
With the exception of Morgoth still having an army after the First and Second Battles, this could work.What was suggested was an ongoing process of attempted undermining Maedhros' spirit. This is a good vantage point where Morgoth can watch his army crush his enemies, while also taunting Maedhros. It also allows us an opportunity to SHOW Morgoth's terror when the sun rises. If he is already safely underground, we will not see this.
That makes me think about the effect of the Sun on demons. Sauron and demonic spies are clearly unharmed by it, otherwise they couldn't pretend to be normal Maiar, Mortals, or whatever. But Morgoth surely would actually be burned/pained by the Sun/Arien, not just afraid of her or the Valarin attack she might herald... so the difference in effect is a bit odd. And then are we going to show that effect happening when Morgoth answers Fingolfin's challenge after the Fourth Battle? He's in constant pain from his Silmaril burns anyway, so it may not be noticeable. Especially if his face is covered by a helmet.